Disk harrow.



W. H. COLE.

DISK HARROW.

APPLICATION FILED MAR. 80, 1908.

, 906,692. Patented Dec. 15, 1 08.

2 SHEETS-SHEET 1.

W H. com. DISK HARROW.

APPLICATION FILED MAR. 30, 1908.

.-9'06, 92- Patented D6G. 15, 1908 2 SHEETS-SHEET 2.

j Zlwuzntoz witnesses I UNITED STATES PATENT OFFICE.

WILLIAM H. COLE, OF CHARLES CITY, IOWA.

DISK HARROW.

To all whom it may concern:

Be it known that I, WILLIAM H. COLE, a citizen of the United States,residing at Charles City, in the county of Floyd and State of Iowa, haveinvented certain new and useful Improvements in Disk Harrows, of whichthe following is a specification, reference being had to theaccompanying drawmgs.

My invention relates to improvements in disk harrows and moreparticularly to means for scraping the earth from the disks of suchimplements.

The object of the invention is to provide a disk cleaning mechanism fora harrow or the like which will be simple, practical and effective andwhich will be operated from the axle of the disks.

IVith the above and other objects in view, the invention consists of thenovel features of construction and the combination and arrangement ofparts hereinafter fully described and claimed and illustrated in theaccompanying drawings, in which Figure 1 is a plan view of a part of adisk harrow embodying my invention; Fig. 2 is a rear elevation of thesame; Fig. 3 is a vertical cross section taken on the plane indicated bythe line 33 in Fig. 1. Fig. 4 is a detail section taken on the laneindicated by the line 44 in Fig. 1; ig. 5 is a detail perspective of thecam member; and Fig. 6 is a detail view of the guide or keeper member.

I11 the drawings 1 denotes a portion of the main frame of the machinewhich may be of any suitable or preferred form and construction, theportion here shown consisting of a horizontal top bar provided withdepending brackets 2 carrying bearings for the axle 3 of the disks 4.The disks are of concaveconvex form and are suitably mounted atintervals upon the axle.

5 denotes the scrapers which are in the form of resilient blades and oneof which is provided for each of the disks and adapted to swing acrossthe same from its center to its eriphery to remove the earth therefrom.baid scrapers are angularly disposed and have their upper ends suitablysecured to a su porting rock shaft 6 disposed longitudina ly in rear ofthe to bar of the main frame and mounted for bot an oscillatory movementand a slight longitudinal sliding or shifting movement in bearingbrackets 7 Specification of Letters Patent.

Application filed March 30, 1908.

Patented Dec. 15, 1908.

Serial No. 424,222.

bolted, as at 8, to the top bar of the main frame.

The shaft 6 obtains its oscillatory move ment from the disk axle 3, asmore clearly shown in Fig. 3. These driving connections comprise anupright crank shaft 9 journaled at its upper end in a bearing bracket 10bolted at 11 upon the top bar of the main frame and journaled at itslower end in a casing 12 loosely mounted on the axle 3 and adapted toinclose a worm 18 and a worm gear 14:, one of which is fixed to the axle3 and the other to the crank shaft 9. Said gear casing 12 is composed oftwo separable sections united by bolts 15, and it effectively excludesdirt from the worm gear. The crank 16 in the upper portion of the shaft9 is connected by a pitman 17 to an oscillatory or rock arm 20 suitablyfixed to the supporting rock shaft 6 of the scrapers. It w1l be seenthat as the harrow moves forwardly the disks will rotate and themovement of their axle 3 will be imparted through the worm gearing, theuprig t crank shaft, the pitman and the rock arm to the rock shaft 6 sothat the scrapers will be oscillated back and forth between the centersand the peripheries of the disks.

For the purpose of holding the scraper blades always at effectiveworking relation with the concave faces of their disks I provide animproved means for shifting or sliding the rock shaft 6 longitudinallyas it is rocked or oscillated. This means comprises a cam member 21carried by said rock shaft and a guide or keeper member 22 carried bythe main frame. The cam member is in the form of a portion of a spiralflange and comprises an angularly disposed plate which projects radiallyfrom a hub 23 adapted to be held in an adjusted position upon the rockshaft 6 by a set screw 24 or any equivalent means. The angular or spiralplate forms a cam and projects into the fixed guide 22 so as to swingback and forth therein as the shaft 6 is operated and thereby shift saidshaft back and forth in a longitudinal direction. The guide 22 is in theform of a recessed plate bolted at 25 to the top bar of the main frameand adapted to receive the cam plate or arm in its recessed portion.Anti-friction rollers 26 are preferably journaled in the bracket so asto engage the opposite faces of the cam plate or arm to reduce friction.

In operation, it will be seen that as the l O O harrow is drawn over theground the scraper blades will be oscillated back and forth over theconcave faces of their disks and owing to the cam device for shiftingthem longitudinally they will be constantly maintained in effectiveworking relation with the concave faces of the disks.

It will be noted that the invention may be easily applied to andadjusted upon disk harrows of the character set forth and that it willbe entirely automatic in its operation and Will need no attention on thepart of the driver of the harrow.

Having thus described my invention what I claim is:

1. In a disk harrow, the combination of a main frame, a horizontal shaftjournaled thereon, a series of Concavo-convex disks fixed to said shaft,a rock shaft mounted. for rotary and longitudinal sliding movement,scraper blades fixed to said rock shaft and adapted to engage saiddisks, a recessed guide bracket fixed to the frame, a radiallyprojecting, angularly disposed cam plate l0n gitudinally adjustable uponthe rock shaft and projecting into the recess in said guide bracket, andmeans for imparting the motion of the disk shaft to said rock shaft.

2. In a disk harrow, the combination of a main frame, a horizontal shaftjournaled thereon, a series of concave-convex disks fixed to said shaft,rock shaft mounted for rotary and longitudinal sliding movement, scraperblades fixed to said rock shaft and adapted to engage said disks, arecessed guide bracket fixed to the frame, a radially projecting,angularly disposed cam plate longitudinal adjustable upon the rock shaftand projecting into the recess in saidguide bracket, superposed bearingsupon the frame and the disk shaft, a vertically disposed crank shaftjournaled in said bearings, a worm gear upon the lower end of the crankshaft, a worm upon the disk shaft in mesh with said worm gear, a crankarm upon the rock shaft and a connecting rod between the crank of saidcrank shaft and said crank arm on the rock shaft, substantially asdescribed.

8. In a disk harrow, the combination of a main frame, a horizontal shaftjournaled thereon, a series of concavo-convex disks fixed to said shaft,a rock shaft mounted for rotary and longitudinal sliding movement,scraper blades fixed to said rock shaft and adapted to engage saiddisks, a bracket plate fixed to the main frame and having its projectingedge recessed, opposing anti-friction rollers journaled in the recess ofsaid bracket plate, a cam member having a hub portion to receive therock shaft, an angularly disposed, radially projecting plate to enterbetween said anti-friction rollers, a set screw in the hub of said cammember for adjustably retaining the latter upon the rock shaft, andmeans for imparting the motion of the disk shaft to said rock shaft.

In testimony whereof I hereunto aifix my signature in the presence oftwo witnesses.

WILLIAM H. COLE. Vfitnesses MonroN WILBUR, FRED. A. FRUDDEN.

